What we are talking about now is the Qing Dynasty and the Tang Dynasty, and the word "big" has been added to demonstrate strictness. The other Eastern Jin Dynasty and the later Tang Dynasty actually show that they used the same country name to distinguish them in different periods. Therefore, the post-Jin title is not honorable enough, and it is understandable to be changed.
At the same time, gold is not a good synonym for ordinary people. The story of Yue Fei's resistance to gold has been handed down from generation to generation. At that time, in the Song Dynasty, the shame of Jingkang occurred, which can be said to be the national mourning of the whole Central Plains region. Therefore, if you still use the post-gold, it is easy to cause resistance and disgust of most people. Huang taiji's reform is to eliminate this pressure of public opinion. Moreover, the word Qing is actually rare in the country name, so the people will not understand it and there will be no other associations.
As we all know, China was very particular about five lines of gossip in ancient times, especially in these appellations. Huang Taiji believed that the Yuan Dynasty belonged to Jin, but it was later destroyed by the Ming Dynasty. The Ming dynasty should be a fire, and fire will kill gold. However, if his country still carries gold, it will still be suppressed by the Ming Dynasty. After all, there were slogans everywhere at that time to fight against the Qing Dynasty and regain sight. Therefore, the name of the country was changed to Qing, and Qing was water-carrying, that is, water genus, in order to contain the Ming Dynasty, which added fuel to the fire, and complete the real reunification.
From the Manchu point of view, this Qing is a good soldier. Therefore, Manchu people are very familiar with it, which shows that it is taking the world on horseback and advocating force.